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поискавой системы для электроныых деталей |
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поискавой системы для электроныых деталей |
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WM8753LEB/RV датащи(PDF) 37 Page - Wolfson Microelectronics plc |
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WM8753LEB/RV датащи(HTML) 37 Page - Wolfson Microelectronics plc |
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37 / 87 page  WM8753L Advanced Information w AI Rev 3.1 June 2004 37 REGISTER ADDRESS BIT LABEL DEFAULT DESCRIPTION 8 LDVU 0 Left DAC Volume Update 0 = Store LDACVOL in intermediate latch (no gain change) 1 = Update left and right channel gains (left = LDACVOL, right = intermediate latch) R8 (08h) Left Channel Digital Volume 7:0 LDACVOL [7:0] 11111111 ( 0dB ) Left DAC Digital Volume Control 0000 0000 = Digital Mute 0000 0001 = -127dB 0000 0010 = -126.5dB ... 0.5dB steps up to 1111 1111 = 0dB 8 RDVU 0 Left DAC Volume Update 0 = Store RDACVOL in intermediate latch (no gain change) 1 = Update left and right channel gains (left = intermediate latch, right = RDACVOL) R9 (09h) Right Channel Digital Volume 7:0 RDACVOL [7:0] 11111111 ( 0dB ) Right DAC Digital Volume Control similar to LDACVOL Table 25 Digital Volume Control GRAPHIC EQUALISER The WM8753L has a digital graphic equaliser and adaptive bass boost function. This function operates on digital audio data before it is passed to the audio DACs. Bass enhancement can take two different forms: • Linear bass control: bass signals are amplified or attenuated by a user programmable gain. This is independent of signal volume, and very high bass gains on loud signals may lead to signal clipping. • Adaptive bass boost: The bass volume is amplified by a variable gain. When the bass volume is low, it is boosted more than when the bass volume is high. This method is recommended because it prevents clipping, and usually sounds more pleasant to the human ear. Treble control applies a user programmable gain, without any adaptive boost function. Bass and treble control are completely independent with separately programmable gains and filter characteristics. The selectable cut-offs scale with sample frequency to give the following cut-off frequencies at different sample rates BC[2:0] CUT-OFF AT FS=8KHZ CUT-OFF AT FS=16KHZ CUT-OFF AT FS=48KHZ 000 22Hz 44Hz 130Hz 001 33.3Hz 66.7Hz 200Hz 010 50Hz 100Hz 300Hz 011 66.7Hz 133.3Hz 400Hz 100 100Hz 200Hz 600Hz 101 200Hz 400Hz 1200Hz Table 26 Bass Filter Cut-off Frequencies for Different Frequencies |
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